Bronchitis is an inflammation of the bronchial tubes, which carry air to and from the lungs. It can be caused by viral or bacterial infections, as well as by irritants like smoke and pollution. Acute bronchitis lasts for a short period, while chronic bronchitis is a long-term condition that often occurs in smokers. Dr. Mayank, a pulmonologist, recommends treatment such as rest, fluid intake, and, in some cases, medications like bronchodilators or antibiotics. If left untreated, bronchitis can lead to complications like pneumonia. Preventative measures include vaccination and avoiding irritants.